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Originally Posted by MNBoxster
The 1st number is the actual weight of the Base Stock of the Oil and is followed by a 'W' - the SAE's esignation for Winter operating (cold start) conditions, the last 2 numbers are the viscosity of the Oil once it reaches a theoretical operating temperature - 150° F. These types of oils are classified as 'non-Newtonian' because of this ability.
Hope this helps...
Happy Motoring!... Jim'99
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That's still technically a Newtonian fluid.